restoring missing icons

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http://askubuntu.com – How can I repair my 12.04? Various icons are missing. Should I apt-get remove and apt-get purge and then apt-get install unity or will that make it worse? I've seen infinite loops as a result of unity --reset and unity --reset-icons. Aside: I have applied this fix to prevent icons from disappearing, so if I can get my icons back, they will probably not go missing again. (HowTos)